Fan stopping device



Fb. 20, 1945. A. N. cLAssoN FAN STOPIIDING DEVICE Filed Jan. 16; 1943 Syvum/ym 412mm( 62053072 'M7/Amm,

Patented Feb. 20, 1945 .FAN s'rorrlNG navos Albert N. Chmn, mand. n1.

Application January 16, 1943, Serial No. 472,844

3 Claims.

This invention relates to a device for stopping l an electrical unit.

An object of the invention is the provision of a device for stopping an electrical unit when a condition arises in a space whereby it is unnecessary to maintain the unit in operation.

Another object of the invention is the provision of a device for opening a circuit to a fan which is used in a sleeping compartment` for cooling the room, when the-temperature of the room falls below a predetermined degree, said device, including a, pair of switches, one i'or opening the (CL 175-375) s circuit to the fan, the other for opening a circuit after said circuit has been closed, to actuate the operative opening means for the switches, the last mentioned circuit being closed temporarily by a thermostatically controlled switch.

The further object of the invention is the provision of a device for cutting o!! an electrically operated apparatus, such as a fan, when the teinperature of the room in which a person is sleeping falls below a predetermined degree to prevent chilling of the person.

l This invention will be best understood from a consideration of the following detailed description in view oi the accompanying drawing forming a part of the specification; nevertheless, it is to be understood that the invention isnot confined to the disclosure, being susceptible of such changes and modifications as detlne no material departure from the salient features of the invention as expressed in the appended claims.

In the drawing: Pig. 1 shows more or less diagrammatically a view in elevation for controlling the operation of an electrical unit.y v

Fig. 2 is a planfview of the same. Fig. 3 is le horizontal section taken along the line 2-2 of Fig. f

Referring more particularly to the drawing, il)

designates a board on which the control elements are mounted. 'I'his board may be of any shape, but generally it is constructed in a manner which would be suitable 4i'or the assembling of the various elements.

A lever Ii is pivotally' mounted at one end on 'a pin l2, which is connected to the board Il.l

The lever is limited by means of stops I3 and I4, projecting outwardly from the board. A spring i5 has one end secured through a bracket i5 connected to the board, while the other end -thereot is connected to a link l1, which is also connected toY a pin i5 proiecting from the lever Il.

A reciprocating rod is pivotally connected at `2i to the lever il, and is provided with a slot l 22 which receives a pin 23 secured to the upper end of a switch arm 24. A second rod 2lil` is Vprovided with a slot 25, which receives a pin 25 at the upper end of a'second switch arm 21. The rod 25n is pivoted on the pin 23.

The switch arm 24 forms part of a switch designated by the letter S, while the switch arm 21 forms part of a switch designated by the letter S'. The switch S includes a link 30 which is connected to a pin 3i on which the arm 24 lis pivotally mounted. A contact member-32 is secured in place as shown at 33 to the board i0 and this member has a fork 34, that receives the switch arm 24 when said arm is in a vertical position as shown in Fig. 1. The link 35 as shownat 35 is secured to the board I0.

'A pair of wires 36 and 31 is connected to a plug which is adapted to be received by the usual house sockets. Wire 31 Vextends to the link 30' while a wire 35 connects the one side of a motor which operates a fan 39 to the contact member 32. Wire 26 is connected to the positive side of the motor. Thus, it will be seenthat the fan will be in operation as long as the arm 24 is received by the yoke 34. However, when said arm is moved away from the yoke the circuit to the same motor will be broken.

The arm -21 of the switchS' is also received by a yoke 45, carried by a contact member 4I, which issecured at 42 to the board i0. A link 42 of said switch is connected at 44 to the board while the opposite end -of said link is connected to a pin 45, upon which the arm 21 is pivotally mounted. The pins 2,3, 35, 42 and 44 are insulated from the board il.

A thermostatic switch is included in the device, generally designated by the numeral 50.

This device includes a scale 5|, a pointer 52, and a coiled thermostatic strip 53, which is connected with a shaft 54 to which the pointer is secured. The other end'of the strip is connected to a binding post 55. One end of the pointer 52, as shown at 55, carries a contactl 51, which is 45 adapted to engage a contact 58, carried by a binding post 55. Posts land 59 are insulated from the connected parts.

A slidable plate 55 carries the binding post 55,v

one end in engagement with extensions 53 while the other end engages in lug 55, secured to the member 55. An ear 55 has a threaded perfora- --an arm 33 of the bracket 15.

its inner end in engagement with the ,extension or ilange 53, so that when the bolt is screwed inwardly against the flange 63 it will force the plate l downwardly against the tension of the spring 54. By this means the contact 53 is adjusted towards or away from the contact 51 for varying the point at which the pointer 52 will cause the contacts to engage by closing the thermostatic switch for a vpurpose which will be presently explained.

A battery 1I is supported by a bracket 1I, secured to the board Ill. A wire 12 connects the oneside of the battery with the binding post 55. The battery is provided with a binding post 13 and 'a wire 14 connects the binding post 13 with a magnetic device 15.

The magnetic device is shown at 15 and is supported by a bracket 18 on the board Ill. The wire 14 is connected with the wire of the magnetic devlceas shown at 11. A wire 18 connects the magnetic )device with one end of the link 43. A

non s1 to receive a threaded bolt sa, which nas wire AI5E has one end connected with member 4I,

lvvliile the other end is connected with binding #post 55. Thus, it will be seen that the switch l S' in connection with the' thermostatically oper` ated switch controls the flow of current from the battery 1l to the magnetic means 15.

An armature 3| is pivotally mounted at 32 on The free end of the armature is in such a position that it will engage an arm 85 projecting laterally from the lower end of the lever Il. 'I'hus it would be seen that when the magnetic means 15 is energized by the battery I5 the amature 8l will be drawn downwardly and forcing the lever II in a direction which is opposite to the direction indicated by the arrow until the arms 24 and 21 again engage the respective yokes 34 and 40.

The slots 22 and 25 permit the lever II to be moved to the dead center without operating the arms 24 and 21 until the said lever goes past the dead center, whence the switches will be snapped open. Thus, sparking at the various electrical contacts will be eliminated.

The links, 30, 32, 4I and 43 are conductors as are the arms 24 and,21. However. an insulating fork secured at 9| to the arm 24 and carrying the pin 23 prevents short circuiting when the rod 20 is formed of a conducting material. Similarly, an insulating fork 52 carries the pin 25 and is secured at 53 tothe arm 21.

When lever II has reached the vstop I4 both switches S and S' are opened so that the flashlight cell 1I is only required to supply current momentarily and therefore such cell will last a long time.

Both switches S and S' may be of any type in which switch S may be opened iirst followed by switch S'. In other words, switch S' remains closed just long enough for, the magnet 15 to move lever I I suiliciently in connection with the spring I5 to open switch S to cut oil the motor to the fan 33 before the circuit to the magnet is cut on.

It will be noted that the lever I I moves through a greater angle to reach the stop I4 than the arms 24 and 21 do to complete their functions. Both rods 20 and 2lia are reciprocated substantially the same distance, however the arms are not oscillated until the outer ends of the slots 22 and 25 engage the respective pins 23 and 26.

` operated unit, including a' thermostatic switch for opening and closing a. circuit to a magnet,

A the combination of a lever, pivoted at one end as the; switch S is closed. However, when the temperature of the room falls below a predeter will cause the contacts 51 and 53 to meet, whence 3 the circuit to the magnetic means 15 will be closed.

The lever l I is moved manually against the stop I3 and the spring I5 will hold the lever against the stop. When said lever is against the stop the pin l23 will be in one end of the slot 22 of the bar23. vAtthistimethepin25willbeatasimilar end of the slot 25. Therefore, the switch arms 24 and 21 will 'beA in engagement with the respective yokes 34- and 43.

As soon as thearm 56 of the device 50 has moved the contact 51 into engagement with contact 58 the circuit to the magnetic means 15 and the battery 1I! will be closed. whence the armature 5I will be drawn downwardly and act on the arm 55, causing the lever II to be moved in the direction indicated by the arrow in Fig. l. When this lever passes the 'dead center relative to the spring I5 said lever will further snap to the left and engage the stop I4. As soon as this happens the switch arms 24 and 21 will be moved away from therespective yokes 34 and 40, thus breaking the circuit to the fan 39 and to the magnetic means 15.

When it is desired to reset the deviceior operating the fan 39, it must be done manually, by

Con-

member adapted to be engaged 'by the firstl mentioned switch lever for closing a circuit to the unit, a second contact member adapted to be engaged by the second-mentioned switch arm for partially closing a circuit, including the magnet and the thermostatic switch, a spring maintaining the lever in position to retain the switch arms engaged with their respective contact members, and an armature operated by the magnet and engageable with the lateral projection for rocking the lever to cause the rods to move the switch arms away from the contact members.

2'. In a system for controlling an electricallyoperated unit, including a thermostatic switch for opening and closing a circuit to a magnet.

.the combination of a lever pivoted at one end and adapted to swing from a vertical position to one side of said position, a spring connected between the lever and a xed point and in a substantially vertical alinement with said lever, a pair of switches adjacent said lever, each switch containing a switch arm and a contact member engageable with its associated arm, one switch opening a circuit to the unit, --the other switch adapted to open a circuit, including vthemagnet and the thermostatic switch, a bar having one end pivoted on the free end of the lever, a second bar in alinement with the iirst bar, means ypiv` otally connectingone end oi.' the second bar with the switch arm of the first-mentionedv inviten,4

the ilrst bar having a. sliding connection with ,the last-mentonedmeans, a cooperating sliding connection between the second bar and the other switch arm,`an` arm projecting from the lever, and an armature operated by the magnet and engageable with the arm on the lever for moving the lever to one side of the vertical so that the spring will act to swing the lever suillciently to move the switch arms away from the contact members.

3. In a system for controlling 'an operated unit including a thermostatic switch for opening and closing a circuit to said switch and a magnet, the combination of a lever pivoted at one end, a spring connected between the lever electricanyother end, a pin projecting from the free end of the switch arm and received by the slot so that when the lever is moved away from the vertical position the bar will be moved and the switch arm will rock the switch arm away from the contact member when the pin on the switch arm reaches the outer end of the slot, a second switch operated by the rod for opening the circuit to the magnet and thermostatic switch, and an armature operated by the magnet for initiating rocking movement of the lever.

ALBERT N. CLASSON. 

